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dc.contributor.authorFossen, Haakoneng
dc.contributor.authorZuluaga, Luisa F.eng
dc.contributor.authorBallas, Gregoryeng
dc.contributor.authorSoliva, Rogereng
dc.contributor.authorRotevatn, Atleeng
dc.description.abstractContractional deformation of highly porous sandstones is poorly explored, as compared to extensional deformation of such sedimentary rocks. In this work we explore the highly porous Aztec Sandstone in the footwall to the Muddy Mountain thrust in SE Nevada, which contains several types of deformation bands in the Buffington tectonic window: 1) Distributed centimeter-thick shear-enhanced compaction bands (SECBs) and 2) rare pure compaction bands (PCBs) in the most porous parts of the sandstone, cut by 3) thin cataclastic shear-dominated bands (CSBs) with local slip surfaces. Geometric and kinematic analysis of the SECBs, the PCBs and most of the CSBs shows that they formed during ∼E–W (∼100) shortening, consistent with thrusting related to the Cretaceous to early Paleogene Sevier orogeny of the North American Cordilleran thrust system. Based on stress path modeling, we suggest that the compactional bands (PCBs and SECBs) formed during contraction at relatively shallow burial depths, before or at early stages of emplacement of the Muddy Mountains thrust sheet. The younger cataclastic shear bands (CSBs, category 3), also related to E–W Sevier thrusting, are thinner and show larger shear offsets and thus more intense cataclasis, consistent with the initiation of cataclastic shear bands in somewhat less porous materials. Observations made in this work support earlier suggestions that contraction lead to more distributed band populations than what is commonly found in the extensional regime, and that shear-enhanced compaction bands are widespread only where porosity (and permeability) is high.en_US
dc.relation.ispartof<a href="" target="_blank">Contractional deformation of porous sandstones. Laramide and Sevier deformation of the Navajo and Aztec sandstones in western USA</a>en_US
dc.rightsCopyright 2015 Elsevier Ltd.eng
dc.subjectSevier thrustingeng
dc.subjectPorous sandstone deformationeng
dc.subjectDeformation bandseng
dc.subjectContractional deformationeng
dc.titleContractional deformation of porous sandstone: Insights from the Aztec Sandstone, SE Nevada, USAen_US
dc.typePeer reviewed
dc.typeJournal article
dc.source.journalJournal of Structural Geology

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Copyright 2015 Elsevier Ltd.
Except where otherwise noted, this item's license is described as Copyright 2015 Elsevier Ltd.